Device for finding the axes or centers of circular bodies, openings, or plane figures.



C. G. LUNDSTROM. DEVICE POR FINDING.- THE AXES 0R CENTERS OF CIRCULAR BODIES, OPENINGS,

OR PLANE FIGURES.

APPLIOATION FILED MAY 10, 1913.

Fatented Dec. 16, $1913.

' UNITED STATE@ PATENII" OFFICE.

` oHARLEsG. LUNosTRoivI, or CHICAGO, ILLINoIs.

'DEVICE Fon FINDING THE Axes 0R CENTERS oF CIRCULAR BODIES, OPENING PLANE FIGURES.

To all whom# 'may concern:

Be it known that I, CHARLES Gr. LUND- s'rnoM, a citizen of the United States, and ar means for readily and easily finding Vthe axis or center of a solid opening or plane figure of oval, elliptical or circular form.

The object of my invention is the production of a deviceof the character mentioned which will be of simple and economical construction and through the medium of which the axisor center of a solid, opening or plane figure o f the form mentioned may be located with the greatest ease and expedition.

Other objects will appear hereinafter. The invention consists in the combinations and arrangements otparts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawing forming apart of this.specitication,and in which-' 4Figure l is a top plan View of a device embodying my invention, the same being shown-arranged for finding the axes of a circular body or plate and also the axes of a circular opening, said solid member andsaid opening being. shown in'dotted lines, F ig. 2 is a view similar` to Fig. 1 showing the device arranged fornse in the location of the axes of an elliptical plane figure, Fig. 3 is an enlarged perspective view showing one -of tlieangular members which register with the periphery of' the plane figure, as

shown in Fig. 2, and Fig'. 4 is an enlarged section taken on line :v4-:v4 of Fig. 1.

The preferred form of construction as illustrated in the drawing comprises two substantially T-shaped members which are l entirely separate and independent 0f each other. IEach oii said members comprises an elongated thin flat stem 1 and a transversely extending ross piece 2 which is rigidly secured to said stem, sc rcws being preferably used in this connection. The cross pieces 2 are. provided with spaced' perfor-ations R adapted for engagement by pins 4.

Specification of Letters Patent.

Application filed May 10, 1913.

ratentednec. 16,1913.

seriarNo. 7es,6s9.

In using the device for finding the axes or center of :1 solid member or plate, or of airopening, the stems l of the parts of the device are arranged with longitudinal edges contiguous as clearly shown in'F ig. 1. The

3 to the .positions desired, Asaid perforations being spaced at equal distances as shown corresponding perforar-tions, tha-t is, said four pins -4 will he engaged with the four perforation's 3 which 'are equally distant -from said contiguous edges of said stein. The pins 4 are of a length sufficient to extend through the-cross pieces 2 and project below the; same as clearly shown in Fig. 4

the center or axes of a solid member or plate or'of an opening, said pins will engage .against the periphery of said member or said opening. The two parts of the device adjacent edges o f the stems 1 in constant contact 'until all four of the pins 4 contact with the periphery of the solid member 5 or of the opening 6 in the member 7, as the case may-be, as clearly Vshown in Fig. 1. 'Yi-'hen all of said pins so contact the axis of the solid ligure or opening acted upon Will be coincident with the contiguous edges of the stems 1, and so that.' by removing one of the parts of the device, as shown in dotted lines in Fig. 1, the exposed longitudinal edge vof the stem l of the other may be used as a st raigh`t edge in describing Vthe axis.` It will e understood. of course that where it i's desired to find the center, it is only required to repeat. the adjustments described in order to locate a second axis, it vbeing clear that the center will be at the point of intereep tion ofthe two axes thereof. Where the device is used in the finding of the center or axes of, plane figures, angular plates 8 are employed which are adjustably secured to the cross pieces 2 by 4the pins 4.

- cross pieces 2 in the sume manner as the pins to be acted upon is suiiieiently small as shown at 9 in Fig. 2. the plates "S will be arranged as shown in full lines in said figure. After adjustment of .said plate upon the cross pieces 2 the T-members of the device. i are adjusted relative to each other, inthe from the contiguous edges of the stems 1, Vthe pins 4 being always engaged with the pins 4 are then adj ustedin the perforations and so .that,"in the use of the device to find are'moved relatively to eachother with the Said plates 8 will be adjusted upon said .4 as above described. When the plane figure 105 tioned as mentioned, said plates 8 may be turned about as shown in dotted lines loca/Ced? on said cross piecesequally distant from shown in Fig. 2, the axes of the figure when `the contiguous edges of the stems l. Where 'the device to ctl'ect registration of.' the eii'ect registration ot' the outer corners vthere- BEST VILBLE COPY same manner as above described until the inner corners or points'ot the plates 8 register with the periphery of the ligure, as

said parts are so adjusted being located at the plane figure as shown at lO is too large to Warrant the adjustment of the parts ot inner corners-ot the plates 8 when posi.l

in Fig. 2, and said members adjusted to of with the periphery ot the figure, the result, as to the location of the axes, beingr the same in both eases. 'After the location of the axes has been determined, one of the memb ers may be removed as before described and the exposed longitudinal edge of the stem l of r the' remaining member utilized as a straight in the describing of the axis A device' ol the constructionset forth is simple and economical in construction and hence may belmamitactured at a low cost, and will be found of high eiliciency in use.

YVhile I have illustrated and described the preferred form ,i construction for carrying my invention into effect, this is capable of variation and 'modification Withoutv depart ing from the spirit of the invention. I, therefore, do not with to be limited to thew precise details of'construetion setfortb, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

l. A device of the kind described comprising two substantially T-shaped members ,each consisting of a stem and a cross piece, said stems when said members are arranged Vin operative relation being positioned with longitudinal edges contiguous; and means said contiguous edges and adapted for registration With the periphery ofi-he object or figure acted upon, substantially as described.

2. A device of the class described comprising two substantially Tfshaped members each consisting of a stem and across piece, said stems,` when said members are in ,operative relation, being` position `with longitudinal edges contiguous-and movable longitudinelljf relative to, each other; and means l pieces being provided with spaced perforar" ruins; and means cooperating with such of said perimations as are equally d1stant from said'contiguous edges adapted for registra- .iion withlhe periphery of the object or ligure acted upon, substantially as described.

4. A device of the class described conirising two substantially T-shaped -members each consisting 'of a stem-and a cross piece, said stems, when said members are in operative relation, being positioned with longitudinal edges contiguous and movable longi-` tudinally relative to each other, said cross pieces being provided with perforations spaced equally in either direction from the contiguous edges of said stems; means ad,- justably mounted upon said cross pieces adapted for registration with the periphery of the object or ligure acted upon; and means engaging said perforations for releasably securing said registering jmeans in position, substantially as described.

A device of the class described comprising two .substantially T-shaped members each consisting of a stem and across piece, said stems, when said members are in operative relation, being positioned with longitudinal edges contiguous and movable longitudinally relative to each other, said cross piecesV being` provided with perforations spaced equallyr in either direction from the contiguous edges of said stems; angular plates adjustably .mounted'upon said cross pieces adapted for registration with the 'pgfaiphery of the object or figure acted uponf CHARLES G. LUNDsTRoM. Witnesses.:

JOSHUA R. il. Po'rrs,

l-lnxpnu F. Liners. 

